5:07 PM PT -- The hearing has wrapped for the day, but one other thing of interest was when Kylie was asked whether or not she thought Chyna’s love for Rob was real or fake. Kylie responded, "I just felt maybe me dating the father of her child had something to do with it." Kylie was then asked if she thought Chyna was dating Rob out of spite to which she replied, "Maybe."
Kylie Jenner says she expressed her concerns to her brother when he got into a relationship with Blac Chyna ... because Kylie's own ex, Tyga, had warned Chyna was violent.
Kylie took the stand Monday in the Chyna v. Kardashian trial ... and Chyna's lawyer asked her about her relationship with Chyna. Kylie says she wouldn't have ever considered Chyna a close friend, but says Tyga -- who has a kid with Chyna -- once showed her a 6-inch long scar on his arm, claiming it was a knife wound at the hands of Chyna.
Chyna's attorney continued questioning, and Kylie revealed Tyga told her Chyna abused drugs and alcohol -- and they were to blame for the violent knife attack.
Kylie says she brought her concerns about Chyna's behavior to Rob Kardashian, but says Rob told her he was going to continue to date Chyna. Kylie said in court, "I felt it was my duty to express my concerns, but ultimately it was up to him."